I recall reading somewhere that there was a Federally-mandated color for propane tanks. Cream, or off-white?. This may be an urban legend, but I did see a spray can marked "Propane tank paint" on a shelf at my local RV dealer.
George Schweikle Lexington, KY
1999 Safari TREK 2830, FMCA 190830, Safari International chapter
1995 Safari TREK 2630, 1983 Winnebago Chieftain, 1976 Midas Mini